code: def _invert_perm(perm):
      perm_inv = [0] * len(perm)
      for i, j in enumerate(perm):
          perm_inv[j] = i
      return tuple(perm_inv)
  
file_path: flax/flax/core/nn/attention.py
imports: import functools
  from collections.abc import Iterable
  from typing import Any, Callable, Union
  import jax
  import jax.numpy
  import numpy
  from jax import lax, random
  from flax import struct
  from flax.core import Scope
  from flax.linen import initializers
  from .linear import default_kernel_init, dense_general
label_desc: Use image node_id 2 for calling a global function with example usage: _invert_perm(perm) and returns: tuple